NGC 3729

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NGC 3729
NGC 3718 with NGC 3729.jpg
NGC 3729 is the galaxy on the right. NGC 3718 is on the left side. Near the top of NGC 3718, Hickson Compact Group 56 can be spotted
Observation data (J2000 epoch)
Constellation Ursa Major [1]
Right ascension 11h 33m 49.3s [2]
Declination 53° 07′ 32″ [2]
Redshift 1,060±1 km/s [2]
Distance 65.7 ± 4.8  Mly (20.1 ± 1.5  Mpc) [2]
Apparent magnitude  (V)11.0 [3] or 11.4 [1]
Characteristics
Type SB(r)a pec [2]
Apparent size  (V)2.9′ × 1.9′ [1]
Other designations
NGC 3729, UGC 6547, MCG +09-19-117, PGC 35711, CGCG 268-051 [2]

NGC 3729 is a barred spiral galaxy located in the northern constellation of Ursa Major. [1] It is located at a distance of circa 66 million light years from Earth, which, given its apparent dimensions, means that NGC 3729 is about 60,000 light years across. It was discovered by German-British astronomer William Herschel on April 12, 1789. [4]

NGC 3729 has a bright nucleus embedded in a bar which measures 0.5 x 0.1 arcminutes. At the end of the bar lies a ring with knots. The outer part of the galaxy is formed by an asymmetric faint nebulosity with condensations. [5] It is possible that the condensation is a disturbed satellite galaxy. [6] In the centre of NGC 3729 is predicted to lie an intermediate-mass black hole, whose mass is estimated to be between 4 and 400 thousands M☉ (104.6 ± 1.0M☉) based on Ks-band bulge luminosity. [7] The galaxy has an inner ring which emits in far ultraviolet and H-alpha, which are considered to be markers of recent star formation activity. [8]

NGC 3729 is member of the M109 Group [9] which is part of the south Ursa Major groups, part of the Virgo Supercluster. [10] It forms a pair with NGC 3718, which lies 11.5 arcminutes to the west. [5] It is possible the two galaxies interacted in the past. [11]

Although no supernovae have been observed in NGC 3729 yet, a luminous red nova, designated AT 2018hso (type LRN, mag. 19.41), was discovered by the Zwicky Transient Facility on 31 October 2018. [12]

The luminous red nova AT 2018hso with James Webb Space Telescope MIRI AT 2018hso in NGC 3729 JWST MIRI.jpg
The luminous red nova AT 2018hso with James Webb Space Telescope MIRI

References

  1. 1 2 3 4 Finlay, Warren H. (2014). Concise Catalogue of Deep-Sky Objects. The Patrick Moore Practical Astronomy Series (2nd ed.). Springer Cham. p. 266. doi:10.1007/978-3-319-03170-5. ISBN   978-3-319-03169-9.
  2. 1 2 3 4 5 6 "NASA/IPAC Extragalactic Database". Results for NGC 3729. Retrieved 2019-01-18.
  3. ↑ "Revised NGC Data for NGC 3729". spider.seds.org. Retrieved 25 November 2018.
  4. ↑ Seligman, Courtney. "NGC 3729". cseligman.com. Retrieved 2026-09-26.
  5. 1 2 de Vaucouleurs, Gerard Henri; de Vaucouleurs, Antoinette; Shapley, Harlow (1964). Reference catalogue of bright galaxies. Austin: University of Texas Press. Bibcode:1964rcbg.book.....D.
  6. ↑ Morales, Gustavo; Martínez-Delgado, David; Grebel, Eva K.; Cooper, Andrew P.; Javanmardi, Behnam; Miskolczi, Arpad (29 June 2018). "Systematic search for tidal features around nearby galaxies". Astronomy & Astrophysics. 614: A143. arXiv: 1804.03330 . doi: 10.1051/0004-6361/201732271 . S2CID   118981195.
  7. ↑ Graham, Alister W.; Scott, Nicholas (1 February 2013). "The MBH-lspheroid relation at high and low masses, the quadratic growth of black holes, and intermediate-mass black hole candidates". The Astrophysical Journal. 764 (2): 151. arXiv: 1211.3199 . Bibcode:2013ApJ...764..151G. doi:10.1088/0004-637X/764/2/151. S2CID   96428441.
  8. ↑ Comerón, S. (9 July 2013). "Inner rings in disc galaxies: dead or alive". Astronomy & Astrophysics. 555: L4. arXiv: 1306.4515 . Bibcode:2013A&A...555L...4C. doi: 10.1051/0004-6361/201321983 . S2CID   56144824.
  9. ↑ Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv: 1011.6277 . Bibcode:2011MNRAS.412.2498M. doi: 10.1111/j.1365-2966.2010.18071.x . S2CID   119194025.
  10. ↑ "The Ursa Major Groups". www.atlasoftheuniverse.com.
  11. ↑ Markakis, K.; Dierkes, J.; Eckart, A.; Nishiyama, S.; Britzen, S.; García-Marín, M.; Horrobin, M.; Muxlow, T.; Zensus, J. A. (20 July 2015). "Subaru and e-Merlin observations of NGC 3718". Astronomy & Astrophysics. 580: A11. arXiv: 1504.03691 . doi: 10.1051/0004-6361/201425077 . S2CID   56022608.
  12. ↑ "SN 2018hso". Transient Name Server. IAU . Retrieved 8 October 2026.
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